How to organize the work of Loader?

Question

Android

I understand that onCreateLoader() , onLoadFinished, onLoaderReset() should be implemented in the callback. But what about the loader itself? In the constructor, you need to unpack the Bundle. In the onStartLoading() method, you need to check if there is a result, and if it is present, call deliverResult(), otherwise forceLoad(). But where to perform the actual download of something. I have seen loading implementations in onForceLoad() and doInBackground(). Where is the best place to do it? And am I going to organize the Loader correctly?